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In more than 95% of trisomy 21 cases, the additional chromosome 21 is ____ in origin, and dosage studies indicate that nondisjunction during ____ is by far the most common cause

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1. In more than 95% of trisomy 21 cases, the additional chromosome 21 is ____ in origin, and dosage studies indicate that nondisjunction during ____ is by far the most common cause





 
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